that game rocks on PC, and you don't need a top rigg!
i can play it with high settings and still get 30fps (8600GT)
i love the multiplayer, it's fast and is awsome with the modifications you can add on your weapons! best deathmatch game i know! (free-for-all)
if you are a pc gamer, buy it for the multiplayer, the single player is the same has the 360 version